Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec bach » vien bach, viec ban, viec bao
bach tuoc » sach duoc, sach nuoc
van thanh » ban thanh
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
van tuan » van quan, van ban, anh tuan
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
co cua » con cua, ca cua, cong cua
o hoc » co hoc, mo hoc, so hoc

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thu nang o hoc. hieu viec bach tuoc ((van thanh) or (van tuan)) co cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu nang o hoc. hieu viec bach tuoc ((van thanh) OR (van tuan)) co cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach thu nang o hoc. hieu viec bach tuoc ((van thanh) or (van tuan)) co cua tre*.